Manufacture of boilers



Dec. 24, 1929 w, wmg gw 11,741,121

MANUFACTURE OF BOILERS Filed Apri 10, 1924 Patented Dec. 24, 1929 UNITESTATES PATENT @FFlfiE WILLIAM H. wmsLow, or cnrcnco, rumors, nssmn'on'ro GEORGE w. DULANY,

an, or cnrcaao, Innmops MANUFACTURE OF BOILERS Application filed April10,

This invention relates to steam boilers, particularly those of the watertube type, and especially to a method of forming elemental parts andbuilding up and assembling component sections of such boilers- The mainobjects of the invention are to provide an improved methodof making ahigh-pressure water tube boiler adapted for convenient and inexpensivemanufacture and capable of greater efficiency in operation; to

provide a method of manufacturing an improved and simplified form ofheaders and header parts; to provide methods and means for assemblingand welding together the several tubes and header sections in a strongand de endable manner; and to provide for fabricating such boilers of aminimum number of diiierent kinds of parts.

An illustrative embodiment of this invention is shown by theaccompanying drawings,

in which;

Figure 1 is a longitudinal vertical section through the steam generatoroutfit, including the fire-box and boilerl. 1 d 1 f Fi re 2 is a eatyenarge pan 0 a singli section of the boiler on the line 2-2 of Figure 3.

Figure 3 is a fragmentary vertical middle section from front to rear ofone of the tube so and header units of the boiler.

Figure 4 is a plan of one of the header secticns of which the backheader is composed.

Figure 5 is a section on line 55 of Figure 4.

Figure 6 is a plan of one of the sections of which the front header iscomposed.

Figure 7 is a section on line 77 of Figure*6.

Figure 8 is a fragmentary rear end elevation of the boiler.

In the construction shown in the drawings the boilerl, as a whole, issubstantially integral molecularly and is mounted 1n the housing 2 overthe grate 3. The said boiler comprises structurally a plurality ofvertlcally disposed bays or sections 4 disposed side by side andconnected for supplying steam to a common steam drum 5 or thelike,positioned on the rear end of the boiler. These sections 4. arealso connected to a common mud drum 1924. Serial No. 705,484.

6 located beneath the front end of the boiler. Each boiler section 4comprises mainly a pair of upright headers 7 and 8, front and rear, incombination with a bank of tubes 9. These tubes are arranged in twovertical rows extending side by side in parallel planes but mutuallystaggered. The front header comprises a vertical series of like tubularsections 10, permanently fastened together end to end, one for eachtube, and the rear header is somewhat similarly constructed of sections11 permanently joined and each connected to one of the tubes 9. p

Each front section 10 is in the form of a short plain vertical tube,formed with a branch tubular outlet 12 midway of its height buthorizontally of? center, as shown in Figure 6, sufiiciently toaccommodate the pipe staggering above referred to, adjacent sectionsbeing mutually inverted. These sections may be formed in any convenientor desired manner, as for instance by drop forging, The rear sections 11are mainly similar in character and appearance but are somewhat larger,and each is provided, on its inner side, with a plain tubular outlet 13corresponding with the outlets 12 on the front sections, and on itsopposite or outer side with an interiorly threaded tubular outlet ornipple 14 in axial alinement with outlet 13.

The method of constructing a boiler section will now be described. Atube 9 and a corresponding pair of front and rear head sections 10 and11 are selected and electrically welded together, first at one end andthen at the other end, car being taken to have each header section rightside up and on the same side of the tube. This is repeated with theother tubes. Then a series of tubes with their header sections attachedare assembled one over another,'one tube at a time, and the headersections welded together electrically until a sufiicient height isattained, each joint or pair of joints being welded successively as thenext adjacent tube is applied, until the entire boiler section isfinished. In as sembling these tubes they are stackedalternately firston one side and then on the other. The position of any tube for thispurpose may e reversed by turning it up-side-down.

I to the common steam chamber. 5 at the top and to the common mud drum 6at the bottom.

The several tubes and header sections are butt welded by means of anelectricwelding machine adapted for the purpose, which machine, however,forms no part of this invention. In order to'facilitate assemblage andproper alinement of the tubes with the corresponding header sections,the tubular outlet projections 12 and 13 are bevelled interiorly so asto receive the exteriorly bevelled ends of the tubes, as shown in Figure3. When the end of the tube is placed against the header outlet portionin the welding machine these parts are forced tightly together, and thewelding current quickly unites the tube and the header member in amolecularly integral manner;

After the tubes are welded to the header sections, the latter are weldedtogether. This ture, the tubes are bent somewhat adjacent to their ends,as at 16 and 17 so as to give the desired inclination for the body ofthe tube, with the ends disposed substantially horizontally for properglinement with the header-section outlets 12 and 13. This idea is shownby Figures 1 and 3. The bending maybe accomplished by well known means,either before or after the header sections are welded to the severaltubes.

In order to facilitate closure of the ends of the headers, or connectionthereof to the steam drum or mud drum, end ieces or caps 18 and 19 areprovided for the ront and rear headers respectively. The front caps areeach provided with a threaded outlet at 20 .for the reception of a plug21. The rear caps are substantially similar in character, but

are somewhat larger. They are adapted for connection to the steam drumat the top, or for threaded connection to the mud drum ,6 at the bottom,as will be apparent from Figure 1. These end caps 18 and 19 are alsowelded to the corresponding end sections of the headers.

As a result of this construction the boiler prpiper is molecularlyintegral throughout,

Subse- L I times prove troublesome 1n boilers as usually constructed.

It may be noted that the number of difierent shapes or structure unitsfor such a boiler is very small, comprising tubes, front headersections, rear header sections, front header caps and rear header caps,all welded together. I

Preferably the lower tubes are somewhat larger than the upper tubes, butthis feature relates merely to design.

Other details of the boiler may be constructed and, arranged inaccordance with well known principles of boiler practice, and need notbe further described herein.

Although but one specific embodiment of this invention is herein shownand described, it is to be understood that numerous details of theconstruction shown may be altered or omitted without departin from thespirit of the invention as define by the following claims.

I claim:

1. The method of making a boiler or boiler section comprising tubes andindividual header sections at the ends of the tubes which includesattaching said individual header sections to the ends of a plurality ofsaid tubes, bending the tubes to a desired form adapted to bring thecorresponding header sections at each end into a predetermined relationto each other, and then assembling the tubes with their attached headersections in alinement at the ends respectively of the tube aggroupments,and welding said sections together successively to form headers.

2. The method of making a boiler or boiler section comprisin tubes andindividual header sections at t e ends of the tubes which consists inwelding the individual header sections to the ends of a plurality ofsaid tubes, bending the tubes to a desired form adapted to bring thecorresponding header. sections at each end into a predetermined relationwith. each other, assembling the tubes with their header sections inalinement, and welding said sections together successively to form apair of headers for said tubes.

Signedat Chicago this 8th day of April WILLIAM H. WINSLOW.

